Over the past 40 years in the United States, the number of vehicles on the road has
A) increased, the number of vehicle miles has increased, and the pollution per car has increased.
B) increased, the number of vehicle miles has increased, but the pollution per car has decreased.
C) decreased but the number of vehicle miles has increased, and the pollution per car has increased.
D) decreased, the number of vehicle miles has decreased, and the pollution per car has decreased.
B
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On the classical supply-demand graph, ________ is highest when prices are low.
A. Demand B. Cost C. Quantity D. Market equilibrium E. Supply
A blackout like the eight-state blackout of 2003 could be prevented by
A) using energy efficient lights in most businesses. B) a self-healing smart electrical grid. C) switching from coal to natural gas for electrical generation. D) greater use of electricity during the work week instead of weekends.
An Intrusive igneous rock body with two parallel surfaces cutting across other rocks is called a ____________
a) Stock b) Batholith c) Laccolith d) Dike e) Sill
Building artificial levees has been said to be self-perpetuating. Why does building a levee in one place
along a river system prompt the construction of another downstream? What will be an ideal response?